conf/layer.conf: Use .= for BBPATH and += for BBFILES
conf/layer.conf: Use .= for BBPATH and += for BBFILES

Provide additional commentary that should help a bit more

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>
Acked-by: Paul Menzel <acd6d3b156327487a919475da61b8867f1e8b249@users.sourceforge.net>
Signed-off-by: Koen Kooi <42e3d96910f922bdd7dd1805fe3f8aff634f391d@dominion.thruhere.net>

WindRiver-OpenSourceLabs/meta-oe-subset,WindRiver-OpenSourceLabs/meta-oe-subset